皮皮学，免费搜题
登录
搜题
【简答题】
某两层钢筋混凝土框架结构，横梁刚度无穷大。第一层楼盖标高处集中质量m1= 80t，第二层楼盖标高处集中质量m2= 60t，每层层4m。结构自振周期T1= 0.378s，T2= 0.167s；主振型为{ X11，X12}T ={ 0.494，1}T，{ X21，X22}T ={1.589，-1}T。特征周期Tg= 0.35s，多遇地震水平地震影响系数最大值amax=0.24，阻尼比为0.05。则相应于第1振型自振周期的地震影响系数a 1=（ ）（注：答案保留到小数点后3位）
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】点M沿图示曲线AOB运动，曲线由AO、OB两圆弧组成，AO段圆弧的半径R1 = 18m，OB段圆弧的半径R2 = 24m，取两圆弧交接处O为弧坐标的原点，其正负方向规定如图。已知点的运动方程为 【图片】 ，式中s以米计，t以秒计。则点从运动开始算起的5秒内走过的路程为（）。（提示，要先求出速度，算出质点开始反向运动的时刻。分段计算路程）【图片】
A.
2m
B.
16m
C.
13m
D.
9m
【简答题】已知质点沿x 轴作直线运动,其运动方程为【图片】,式中x 的单位为m,t 的单位为 s．求：质点在该时间内所通过的路程为（填数字） m；
【单选题】What might happen to the drivers who illegal substances?
A.
They will be sent to a laboratory.
B.
They will lose their licences.
C.
They will be fined and could lose their licences.
D.
They will be sentenced guilty.
【单选题】What might happen to them if they crossed the bridge?
A.
They might arrive at home earlier.
B.
They might fall into the river and die.
C.
Nothing would happen.
【简答题】已知质点沿x 轴作直线运动,其运动方程为【图片】,式中x 的单位为m,t 的单位为 s．求：t＝4 s时质点的速度大小为（填数字） m/s
【简答题】已知质点沿x 轴作直线运动,其运动方程为【图片】,式中x 的单位为m,t 的单位为 s．求：质点在运动开始后4.0 s内的位移的大小为（填数字）m；
【单选题】What might happen to the two codes in the future?
A.
Nothing will happen to them.
B.
There might be another code break off from the two.
C.
They might reunite together.
D.
They might change the rules and scoring system from women's teams.
【单选题】What did the doctor think might happen to Ellen?
A.
She might put on more weight.
B.
She might stop eating too much.
C.
She might have a heart attack.
D.
She might go to another doctor.
相关题目：