美国标准中的地震动参数概念(中英文对照)

2021年2月14日发(作者：sophone)

Design

earthquakes.

The

design

earthquakes

for

hydraulic

structures

are

the OBE and the MDE.

设计地震：

水工结构的设计地震有< /p>

OBE

和

MDE

，即运行基准地震和最大设计地震。

The actual levels of ground motions for these earthquakes depend on the

type

of

hydraulic

structure

under

consideration,

and

are

specified

in

the

seismic design guidance provided for a particular structure in

conjunction with ER 1110-2-1806.

地震动参数的实际取值跟水工建筑物的类型有关，

< p>
具体可参照

ER

1110-2-1806

。

(1) Operating basis earthquake (OBE). The OBE is an earthquake that can

reasonably be expected to occur within the service life of the project,

that is, with a 50 percent probability of exceedance during the service

life.

The

associated

performance

requirement

is

that

the

project

function

with little or no damage, and without interruption of function.

运行基准地震（

OBE

）：

OBE

是指在工 程的服务生命周期中可能合理预期发生的

地震，即在工程生命周期中超过

50%

的发生概率，在该地震作用下，工程的相关

性能 要求几乎没有或没有破坏，工程的相关功能没有中断。

(2) Maximum design earthquake (MDE). The MDE is the maximum level of

ground motion for which the structure is designed or evaluated. The

associated performance requirement is that the project performs without

catastrophic failure, such as uncontrolled release of a reservoir,

although

severe damage or

economic

loss

may be

tolerated. The MDE

is set

equal

to

the

maximum

credible

earthquake

(MCE)

or

to

a

lesser

earthquake,

depending

on

the

critical

nature

of

the

structure

(see

ER

1110-2-1806

and

paragraph 2-4b).

最大设计地震（

MDE

）：

MDE

是结 构设计或评估的最大地震动水平。在该地震作

用下，

虽然引发严 重的经济损失和破坏，

但是水工结构的相关性能要求不至于遭

到 毁灭性的破坏，

比如，

水库库水不至于不受控制地下泄。

依据结构的关键特性，

MDE

等于或小于

MCE

（最大可信地震），参见

ER 11 10-2-1806

的

2-4b

段。< /p>

(3) The MCE is defined as the greatest earthquake that can reasonably

be expected to be generated by a specific source on the basis of

seismological and geological evidence.

最大可信地震（

MCE

）：

< p>
MCE

是基于地震和地质证据，某个震源合理预期可能发

< br>生的最大地震。

e. Earthquake ground motion(s). The ground motions for the design

earthquakes

are

defined

in

terms

of

smoothed

elastic

response

spectra

and,

if required, also in terms of acceleration time- histories. Standard

ground

motions

selected

from

published

ground

motion

maps

can

be

used

in

preliminary

and

screening

studies,

and

for

final

design

or

evaluation

in

areas

of

low

to

moderate

seismicity

where

the

earthquake

loading

does

not

control

the

design.

Site-specific

ground

motions,

as

described

in

Chapter

3, are required for projects with high to significant hazard potential

in case of failure and located in areas of high seismicity, and in areas

of moderate seismicity where the earthquake loading controls the design

(ER 1110-2-1806). < /p>

地震动参数：设计地震的地震动参数可以是光滑后的弹性反应谱，如果有需要，也可以示< /p>

加速度

-

时间历程曲线。对初步的或者方 案比选阶段的研究，标准地震动参数可以从已出版

的地震动参数图上面获取。

< p>
在较低或中等地震强度区域的最终设计和评估，

地震产生的荷载

< p>
并不是控制因素。第三章所讲述的特定场地的地震动参数针对的是处于高地震地区的工程、

地震是其失事的高影响因素的工程，

或者虽然位于中等地震地区，

但地震荷载是设计的控制

因素的工程。

Design Earthquakes and Ground Motions

设计地震和地震动

a. Maximum credible earthquake (MCE).

This earthquake is defined as

the greatest earthquake that can reasonably be expected to be generated

by a specific source on the basis of seismological and geological evidence.

Since a project site may be affected by earthquakes generated by various

sources, each with its own fault mechanism, maximum earthquake

magnitude, and

distance from the site, multiple MCE’s may be defined

for the site, each with characteristic ground motion parameters and

spectral shape. The MCE is determined by a DSHA.

1

、最大可信地震（

MCE

）

MCE

定义为基于地震学理论和地质证据某 个震源合理预期产生的最

大地震。

一个工程可能同时被几个震源 产生的地震所影响，

每个震源

有它自己的震源机制、最大地震强 度，距离工程场地的距离也不同，

因此，一个场地对应多个

MC E

，对应各自的地震动参数和反应谱。

MCE

< br>由确定性地震危险性分析

（

DSHA

）确定。

b. Maximum design earthquake (MDE).

The MDE is the maximum level

of ground motion for which a structure is designed or evaluated. The

associated performance requirement is that the project perform without

catastrophic failure, such as uncontrolled release of a reservoir, although

severe damage or economic loss may be tolerated. For critical features,

the MDE is the same as the MCE. For all other features, the MDE shall

be selected as a lesser earthquake than the MCE which provides